Samsung Analysis

Load Library

library(tree)
library(stringr)
library(randomForest)
## randomForest 4.6-7
## Type rfNews() to see new features/changes/bug fixes.

Processing

Download the data & read the data in

setwd("/Users/Carlos/Dropbox/Courses/Data Analysis/Exercices/Data Analysis/Data Analysis 2/code/SamsungAnalysis/")
getwd()
## [1] "/Users/Carlos/Dropbox/Courses/Data Analysis/Exercices/Data Analysis/Data Analysis 2/code/SamsungAnalysis"
if (!file.exists("../../data/samsungData.rda")) {
    download.file("https://spark-public.s3.amazonaws.com/dataanalysis/samsungData.rda", 
        destfile = "../../data/samsungData.rda", method = "curl")
    dateDownloaded <- date()
    dateDownloaded
}

load("../../data/samsungData.rda")

Munging Data

punct <- c("\\(", "\\)", "\\-", "\\,")
for (i in punct) {
    names(samsungData) <- str_replace_all(names(samsungData), i, "_")
}
samsungData$activity <- as.factor(samsungData$activity)
samsungData$activityNum <- as.numeric(samsungData$activity)

Look at the data set

# head(samsungData) summary(samsungData) sapply(samsungData[1, ], class)
table(samsungData$activity)
## 
##   laying  sitting standing     walk walkdown   walkup 
##     1407     1286     1374     1226      986     1073
table(mapply(FUN = class, samsungData))
## 
##  factor integer numeric 
##       1       1     562

Find out about missing values

sum(is.na(samsungData))
## [1] 0

Prediction

1. Find the right data

2. Define your error rate

3. Split data into

Training

For this analysis the training set must include the data from subjects 1, 3, 5, and 6

trainingSet <- samsungData[samsungData$subject == c(1, 3, 5, 6), ]

Testing

The test set is the data from subjects 27, 28, 29, and 30

testSet <- samsungData[samsungData$subject == c(27, 28, 29, 30), ]
for (i in 1:562) {
    ## plot(trainingSet[,i], pch=19, col=trainingSet$activityNum,
    ## ylab=names(trainingSet)[i])
    print(names(trainingSet)[i])
    boxplot(trainingSet[, i] ~ trainingSet$activity, data = trainingSet, main = names(trainingSet)[i], 
        ylab = names(trainingSet)[i])
}
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## [1] "angle_tBodyAccMean_gravity_"

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## [1] "angle_tBodyAccJerkMean__gravityMean_"

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## [1] "angle_tBodyGyroMean_gravityMean_"

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## [1] "angle_tBodyGyroJerkMean_gravityMean_"

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## [1] "angle_X_gravityMean_"

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## [1] "angle_Y_gravityMean_"

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## [1] "angle_Z_gravityMean_"

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## [1] "subject"

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